Why do Apes, Gorillas Beat their Chest & Sound Hollow?
The shocking, real reason why gorillas pound their chests
Stock photo of Mountain gorilla (Gorilla beringei) silverback beating chest and charging.... Available for sale on www.naturepl.com
Brian Lilly on Twitter: "Western Lowland Gorilla 'Kiondo' chest beating with four carrots in his mouth @PaigntonZoo #gorilla https://t.co/6rrK759pm7" / Twitter
Why do Gorillas beat their chest? — Everything you need to know
Gorillas beat their chests to size each other up, researchers say | Animal behaviour | The Guardian